Grating structure



March 3, 1942. G. G. GREULICH GRATING STRUCTURE 2 Sheets-Sheet 1 Filed Dec. 29, 1937 have 6E4LD 6. 6e

EUL/C i Patented Mar. 3, 1942 UNITED STATES PATENT OFFICE 1 Claim.

1937, there is disclosed a grating structure which 1 very eil'wtively distributes both positive and negative moment as well, as shearing stresses,

and particularly those which are directed laterally. Further, this patent discloses the pro vision of a grating structure comprising horizontal bars which are transversely connected, or laced, by transverse bars which, when in assembled position, have their upper edges substantially flush or slightly below the upper edges of the longitudinal bars, together with elements which may optionally be used to till the spaces between the longitudinal bars and thus serve to retain the filling material and thereby prevent its coming into contact with the stmcture upon which the grating of the invention is adapted to rest.

It is among the objects of the present invention to provide a grating structure having not only the advantages ascribed to that of the Patent No. 2,089,891 but one which, in addition, provides increased bearing area for the trans verse bars.

In my co-pending application Serial No. 177,105, entitled Grating structure" filed November 29, 1937, I have disclosed and claimed a device which provides increased bearing area for the transverse bars over that which is inher'ent in the device of my Patent No. 2,089,891; and one which also eliminates sharp re-entrant angles in the notches of the longitudinal bars.

In addition, the device of said application is intended for use as an open flooring.

sharp re-entrant angles in the notches of t e longitudinal bars. The device of this second application is also intended for use as an open flooring; and is calculated to provide for increased traction over that of said first-named co-pending application.

The device of the present invention is intended not only to provide the advantages aflorded by the patent and the two co-pending applications referred to, but also to'provide for further increased traction. i

The foregoing and other objects will be apparent after reierring to the drawings, in which:

Figure l is a fragmentary plan of the device of the invention;

Figure 2 is a fragmentary and elevation of the device of Figure 1;

Figure Z5 is a sectional of Figure 2;

Flgmi'e is a sectionalview on the line IVIV of Figure 2; 1

Fig. 5 is a fragmentary of a transverse bar. 1

Fig. 6 is a fragmentary elevation of a modified transverse bar.

Fig. 7 is a fragmentary elevation of a modified tertiary bar.

Pig. 8 is a fragmentary perspective of the bars of Figs. 6 and 7 in operative relationship.

Referring more particularly to the drawings,

View on the line IHQ-III Us the numerai 2 designates the web. of the longi- 'tudinal bar of the invention, winch is provided on its edges with a head 3 and a foott.

Adjacent their heads 3, the longitudinal bars are provided on their webs if with enlargements or ribs i which project from both sides thereof. These enlargements 6 are substantially rectangular in section and may extend the full length of the longitudinal bars.

A plurality oi novel L-shaped slots 1 are arranged in the web 2 of each of the longitudinal bars immediately below the head 3, and in such manner as to have their longest portions extending along its axis, which provides a shorter downwardly extending portion 8. The downwardly extending portions 0 of each of the L-shaped slots extend into the enlargements or ribs 8. The corners of the slots 1 are rounded, as shown at 1', in order to reduce tendency to tear.

In installing the grating structure, the longitudinal bars are arranged in parallel spaced relationship with their L-shaped slots 1 in substantial alignment.

The transverse or "lacing bar of the hamtion is indicated at 0, and is substantially rectangular in cross-section. Each of the transverse bars I is provided on one of its edges with a plurality of recesses ll having concave bottom walls, as at H. The side walls II of the recess 10 conform substantially to a portion of the head I of the longitudinal bars.

In installing the transverse bars I, they are inserted through the longest portions of the L- shaped slots 1, until the various recesses II are immediately below the heads I of the longitudinal bars. The transverse bars I are then rotated approximately 90 degrees which permits the bottom walls I! of the recesses II to engage the bottoms of the heads I of the longitudinal bars, and the upper or outer edges of the transverse bars 9 will be materially lower than the corresponding edges of the longitudinal bars.

The transverse bars I are welded to the longitudinal bars while in this position at diagonally opposite corners of the union as indicated at II.

The function of the enlargements 6 which proiect from the sides of the webs I of the longitudinal bars is to provide more bearing area for the transverse or lacing bars 0. Thickening the metal in this manner at the point of bearing decreases bearing pressures while, at the same time, permitting the use of a web which is otherwise thin.

Referring particularly to Figures 1, 2, 3 and 5 of the drawings, it will be noted that the upper or outer edges of the transverse bars are deeply notched, as at ii, to receive the full width of the longitudinally extending tertiary bars l'l. According to a modification which is illustrated in Figures 6, 7 and 8 the longitudinally extending tertiary bars herein designated as 11' may also be notched, as at it, to interlock with shallower notches l! in the transverse bars I. In either case the transverse bars I and longitudinally extending tertiary bars (I! or I'l are welded at diametrically opposite corners of the union as indicated at 20. According to both constructions, it is a feature of the present invention that the upper edges of the longitudinal primary bars and the upper edges of the longitudinally extending tertiary bars (II or II) will 45 tertiary bars (II or I1) to present elevated wearing surfaces.

It is to be noted that the foregoing assembly is such that the longitudinal primary bars and the longitudinally extending tertiary bars (H or II) extend transversely with respect to the direction of trafiic represented by the arrow of Figure 1. This provides for excellent traction.

While I have shown and described several specific embodiments of the present invention, itwillbeseenthatIdonotwishtobelimited exactly thereto, since various changes may be made without departing from the scope of the invention as defined by the following claim.

I claim:

A grating of the character described formed of a plurality of series of bars extending in intersecting relation, the bars of one series being of substantially I-shaped cross section and provided with longitudinally extending thickened portions in spaced relationship with respect to their head and foot portions, the web portion of said bars of I-shaped cross section having a plurality of spaced apertures extending into said thickened portion, a bar of a second series of said series of bars being inserted through each of said apertures, said second series of bars having their upper longitudinal edges notched to conform substantially to the section of the head portions of said first series of bars and being positioned relative to said first series of bars so that their upper longitudinal edges are below the plane of the upper edges of said first series of bars, the bars of said second series of bars being provided with a plurality of spaced notches extending downwardly from the upper edges thereof, and a third series of bars disposed parallel to the bars of said first series and received in said notches, said third series of bars having their upper faces disposed on a plane parallel with the plane of the upper edges of said first series of bars, whereby to form a grating having a plurality of rectangular shaped open spaces of a size equal in one direction to the distance between two adjacent bars of the second series of bars and less than the distance in the other direction between two adjacent bars of the first series of bars.

GERALD G. GREUHCH. 

